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geophysical methode for detecting coal

Geophysical Methods & Applications

Geophysical Methods & Applications SubSurface Surveys & Associates, Inc., established in 1988, specializes in near-surface geophysics and utility locating services and is dedicated to establishing strong client relationships. SubSurface Survey's extensive education and experience

geophysical detection of water in coal mines

DC resistivity method is one of the important geophysical methods, which is interpreted based on conductivity difference between rock and water. In recent years, this method is widely used for detection and real-time monitoring of water-bearing structures in tunnels and coal mines. 2.1. Routine detection…

Research and Application of In-seam Seismic Survey ...

of coal seam, and its roof and the floor (Liu et al., 1993, 1994). The ISS is a coal mine geophysical exploration method for detecting underground geological hazards, such as coal seam thickness variation, faults, collapse columns and etc. By blasting and forming the seismic, it collects and interprets the channel wave. (Liu, 1997)

APPLICATIONS OF THE ELECTRICAL RESISTIVITY METHOD …

Geophysical Technologies for Detecting Underground Coal Mine Voids, Lexington, KY, July 28-30, 2003 2 Resistivity of a material is a fundamental physical property related to the ability of a ma-terial to conduct electricity. If R is the resistance of a block of conductive material hav-

Geophysical and Image Processing Methods for Detection of ...

(1989). Geophysical and Image Processing Methods for Detection of Fireholes in Brown Coal, Latrobe Valley. Exploration Geophysics: Vol. 20, No. 1-2, pp. 153-158.

Keys to Successfully Using Geophysics to Detect Mine Voids ...

Geophysical Methods for Void Detection ... Geophysical Imaging of an Underground Coal Mine Geophysical Imaging of a Karst Sinkhole and Void Beneath Airport Runway. 5/5/2015 10 Geophysical Imaging of Sinkholes and Underground Voids Aerial Photo Sink - Electrodes 130 – 170 ERI Profile

The Use of Geophysical Methods to Detect Abandoned Mine ...

In recent years, geophysical testing has been used as a tool to initially screen undermined sites in an effort to detect the location of possible voids or disturbed geologic strata. Using geophysical data, borings may be located in areas underlain by anomalous conditions, rather than on an arbitrary grid pattern. Two methods that appear to show ...

GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ...

lows. The gravity method also enables a prediction of the total anomalous mass (ore tonnage) responsible for an anomaly. Gravity and magnetic (discussed below) methods detect only lateral contrasts in density or magnetization, respectively. In contrast, electrical and seismic methods can detect vertical, as well as lateral, contrasts of resistivity

Detection and delineation of coal mine fire in Jharia coal ...

geophysical methods were used to detect the surface and subsurface coal mine fires. Geophysical techniques used in the present study are apparent resistivity, self-potential (SP), magnetic method and thermography. Geophysical anomalies such as low SP value of −60 mV, high negative magnetic response and low apparent resistivity value helped ...

Exploration geophysics - SEG Wiki

Exploration geophysics is the applied branch of geophysics which uses surface methods to measure the physical properties of the subsurface Earth, along with the anomalies in these properties, in order to detect or infer the presence and position of ore minerals, hydrocarbons, geothermal reservoirs, groundwater reservoirs, and other geological structures.

Circular 891 - Geophysical Logs as a Source of Coal Bed Data

A gamma ray log is the most versatile of the geophysical logs for the following reasons: (1) it does not require fluid in the hole; (2) it is not sensitive to small variations in hole diameter; and (3) it can be used to detect coal beds through well casing. In fact, near-surface gamma ray logs of cased oil and gas wells are a prime source of ...

- CHINACAJ

In order to realize fine comprehensive geophysical detection for coal mine goafs,based on the analysis of type classification,characteristic and applicabl e conditions of the mature surface geophysical methods,comprehensive geophysical cases,the optimization of surface comprehensive geophysical methods was carried out.The results showed that in order to achieve accurate comprehensive surface ...

Geophysical Prospecting Technology and Engineering - CCTEG ...

Geophysical Prospecting Technology and Engineering. Relying on the advantages of the integrated exploration technology of surface, underground and well-to-surface unit, the institute forms exploration engineering industry which serves the safe and efficient mining of coal resources. Meanwhile, it provides specialized services such as ...

Research and application of the underground fire detection ...

The comprehensive geophysical method for fire source detection is also applied to gob detection (Liu et al., 2005, Li et al., 2014), and its principle is similar to that of fire area detection. However, the problem of these integrated geophysical method is that the detected data are analyzed separately, and all index data are not fused.

(PDF) Subsurface Monitoring of Geological CO2 Storage ...

Seismic, electromagnetic, gravitational, and geodetic methods are the four broad types of subsurface geophysical monitoring examined. As a conclusion, the seismic method seems most suitable for the CO2 sequestration monitoring. Table A-1 is a summary of those geophysical methods …

Electrical resistivity of coal-bearing rocks under high ...

The geophysical characteristics of coal and rock (such as magnetic susceptibility, remanent magnetization, self-potential and resistivity) in coal-fire areas will be changed dramatically at high temperature, which constitutes the foundation of corresponding geophysical methods to detect coal …

Detection of Abandoned Underground Coal Mines by ...

Acid drainage produced by abandoned coal mines continues to cause serious water pollution problems. Without knowing the exact location of the concealed openings and the extent of the mine, source abatement techniques are virtually impossible. Drilling is the only known method for accurately determining the location and extent of the mine voids, but this is extremely expensive.

GEOPHYSICAL METHODS FOR COAL FIRE DETECTION AND …

Within the framework of the Sino-German research initiative "Innovative technologies for exploration, extinction and monitoring of coal fires in Northern China" a number of different geophysical methods have been applied to determine their use on coal fire detecting, accompanying the extinguishing processes, controlling of the extinction and finally monitoring the extinction success.

Literature survey on the advance detection of dykes in ...

literature survey, different exploration and geophysical methods that could be used to detect dykes ahead of underground coal mine workings. In this study a range of geophysical and exploration methods have been identified which are generally used in the mining industry. Each different method …

Overview on the application of geophysics in coal mining ...

Since their introduction to the coal mining industries of the United Kingdom and West Germany in the 1970s, geophysical methods are now utilised in coal mining around the world. The range of applications in both surface and underground mining is extensive. Applications include coal seam mapping and geological fault detection, lithological ...

Remote detection of underground coal mine fires using ...

Abandoned coal mine fires can be found in coal basins across the United States and around the world. These fires can burn for decades, resulting in the emission of toxic gasses and smoke, and prompting subsidence damage to both homes and property. In order to facilitate containment and ...

Application of Comprehensive Geophysical Prospecting ...

2.2. Geophysical Characteristics. In order to avoid the multisolution of the single geophysical exploration method, improve the accuracy of exploration, and have a qualitative understanding of the geophysical characteristics of the exploration area, the resistivity logging method [24, 25] is used to study the resistivity distribution law of different depth strata in the exploration area.

(PDF) A Guide for Applying Geophysics to Coal Mining ...

Geophysical methods, including gravity, electrical resistivity, ground penetrating (GPR), and airborne thermal imaging methods (e.g. Breytenbach and Bosch 2011;Van Schoor 2002; Van Schoor and ...

Detecting top of coal - Mining3

The method of detecting Top of Coal while drilling brings significant benefits to surface mining operations, including: Providing a reliable indication of approach to Top of Coal that will enable drilling to be stopped before touching coal or at a minimum standoff distance. Increase production by reducing damage to coal from blasting.

Research On Fine Interpretation Technology Of ...

Research On Fine Interpretation Technology Of Comprehensive Geophysical Prospecting In Burnt Rock Area ... of different data processing methods,established similar to Zhang Jia Mao interpretation method and index analysis of coal:(1)Using the polar method to make the magnetic anomaly produced by the burned stratum can make the abnormal shape ...

Geophysical Methods, Exploration Geophysics » Geology Science

Geophysical methods may from part of a larger survey and thus geophysicists must be in contact with the whole survey team and particularly to the client. ... (coal, gas, oil) Regional geological studies (over areas of 100s of km2 ) ... Electromagnetic methods detect anomalies in the inductive properties of the earth's subsurface rocks.

Archived: Locating and Characterizing Abandoned Mines ...

Geophysical Technologies for Detecting Underground Coal Mine Voids Forum July 28-30, 2003 – Lexington, Kentucky LOCATING AND CHARACTERIZING ABANDONED MINES USING MICROGRAVITY by Richard C. Benson1, Ronald D. Kaufmann1, Lynn Yuhr1, Richard Hopkins2 ABSTRACT Surface geophysical methods can be an important part of any site characterization effort.

T C M Application of Geophysical Technique in the Coal …

character of the earth, the geophysical method can be classified into electrical method, magnetic method, seismic method, geothermal method. In fact, there are no differences between common geo-physical methods and coal mining geophysical method in the principle. However, the coal mining geophysical methods are restricted in the coal mining tunnel.

geophysical methode for detecting coal - nfrs.it

Know More ; Exploration geophysics - Wikipedia - Know More Exploration geophysics is an applied branch of geophysics, which uses physical methods, such, The most direct method of detection of ore via magnetism involves detecting iron, Electric-resistance methods such as induced polarization methods can be useful for directly detecting sulfide bodies, coal and resistive rocks....

Coal Exploration and Mining - EOLSS

compilation, surface geophysics, drilling for coal, and the collection and description of drill cores, after which the assessment of coal reserves is discussed. In the second part, two basic methods of extracting coal, i.e. surface mining and underground mining, are introduced.

Geophysical Detection of Outbursts | Outburst ...

Geophysical detection of outbursts. Geophysical techniques provide the opportunity for remote assessment of the state of a rock mass and to remotely monitor changes in its behaviour. Geophysical techniques are widely used for these purposes in resource exploration and extraction. Because coal outbursts can be associated with geological ...

Magnetometer measurements to characterize a subsurface ...

In this study, various geophysical methods were used to detect the surface and subsurface coal mine fires. Geophysical techniques used in the present study are apparent resistivity, self-potential ...

Geophysical Void Detection Demonstrations …

GEOPHYSICAL METHODS The selected geophysical methods were employed at the same survey site to provide: 1) a more comprehensive data interpretation; 2) the basis for the performance evaluation; and 3) to determine the advantages and limitations of these technologies to detect accurately mine voids in a cost-effective manner.